John Judis, writing...

...in the New Republic, has as good a description of today's Republican Party as any I've read recently:

Over the last four decades, the Republican Party has transformed from a loyal opposition into an insurrectionary party that flouts the law when it is in the majority and threatens disorder when it is the minority. It is the party of Watergate and Iran-Contra, but also of the government shutdown in 1995 and the impeachment trial of 1999. If there is an earlier American precedent for today’s Republican Party, it is the antebellum Southern Democrats of John Calhoun who threatened to nullify, or disregard, federal legislation they objected to, and who later led the fight to secede from the union over slavery.